Coring or perforating device



P 1952 c. M. MUGLER 2,611,434

CORING 0R PERFORATING DEVICE Filed Jan. 12, 1948 2 Si-lEETSSI-IEET 1 20g 14 17 dwxazzsfljzwzzg 1 20 '5 INVENTOR.

Patented Sept. 23, 1952 UNITED STATES OFFICE GORING R PERFORATING DEVICECharles M. Mugler, Los Angeles, Calif.

Application January 12, 1943, Serial No. 1,803

6 Claims. 1 This invention relates to piercing, holing, perforating, orcoring mechanisms, and particularly to a device for partiallyperforating or piercing a material normally difficult to make clean-cut,accurate, and symmetrical holes therein.

Devices or punches for making holes or apertures in materials arewell-known, the present invention, however, performing an operationwhereby a multiplicity or plurality of apertures are made in a materialin which it is difficult to cut or punch smooth, uniform, and sharpholes. It has been found that the desired type of opening cannot be madesimply by in serting a pointed punch or rod and withdrawing it from thematerial. holes partially through the material are desired, thesimultaneous making of the holes has been difficult to perform withknown equipment.

With the present invention, not only are a large number of clean-cutholes possible, but

"they are uniform and may be of diiierent shapes. The particularmaterial being cored is Fiberglas which has been molded with a resinousbinder, or other similar type of binder, into squares or tiles ofrectangular form, and which have been found to have desirable soundabsorbing characteristics. By the use of such tile, acoustic absorptioncan be increased, and the sound absorption characteristic may becontrolled by the number, diameter, spacing, and depth of the holes inthe material. The material has several important features; namely, it

, is fire proof, it may be decorated by painting or otherwise, it istermite-proof, and it is almost indestructible by the elements. It hasbeen found, however, that by coring the material as mentioned above, itis provided with increased sound absorbing qualities and may be given apredetermined sound absorbing characteristic within the audio range.Furthermore, it can be repeatedly painted with any type paint afterpunched, without any decrease in sound absorption.

The principal object of the invention, therefore, is to facilitate thecoring of a solid or felted material.

Another object of the invention is to provide an improved coring devicefor Fiberglas blocks or tile.

A further object of the invention is to provide a device for punching alarge number of holes in a Figerglas tile block in which the holes areuniform and clean-cut.

A still further object of the invention is to pro- Since a large numberof vide an improved coring device for Fiberglas, mineral, or rock woolfiber tile.

Although the novel features which are believed to be characteristic ofthis invention will be pointed out with particularity in the appendedclaims, the manner of its organization and the mode of its operationwill be better understood by referring to the following description readin conjunction with the accompanying drawings, forming a part hereof, inwhich:

Fig. 1 is a perspective view of the coring or punching device of theinvention.

Fig. 2 is a plan view of the device shown in Fig. 1.

Fig. 3 is a cross-sectional view of the invention taken along the line33 of Fig. 2.

Fig. 4". is a perspective view of the product obtained after passingthrough the invention.

Fig. 5 is an enlarged cross-sectional view showing the invention in acoring position.

Figs. 6 and 7 are detailed views showing modifications for heating thepunching rods, and

Fig. 8 is a perspective view of varying shapes of punching rods whichmay be used in the invention.

Referring now to the drawings, in which the same numerals refer to likeelements, a base plate 5 is mounted upon suitable legs or posts 6, andunder which are attached a pair of hydraulic cylinders l. Slidablymounted on four posts [0, the posts being mounted on the base plate 5,is an index-pressure unit 8 including a backing plate i2 and insulatorplate 25 and a punch rod actuating and heating unit 13. The plate 12 isof material having a very low thermal expansion. Between the plate 12and the base plate 5 are studs l5 with their associated nuts I6 andsurrounded by coil springs IT. A pair of piston rods 20 pass through thebase plate 5 and the plate [2, and are adapted to pull the plate l2,and, consequently, the plate 25 toward the base plate 5 when air orother hydraulic fluid is forced into the cylinders through conduits 22.When the hydraulic pressure is released, the springs I! will raise theplate 12 to the nuts 16 of the studs l5.

The plate. l2 and plate 25 are fastened together by bolts M, or othersuitable means, and are provided with a plurality of indexing holes 24.The plate 25 is formed of a number of laminated sheets of asbestos orsimilar heat insulating material. Attached to the base plate 5 toposition the article 30 to be perforated, are guides or runners 3|,these guides having a height slightly less than the width of the blockor tile 30, so as "48 by machine screws 49.

cable or cord 62'.

.ing of the material.

heights may be used for other materials. A simi-.

lar back stop is provided to further position or align the material.

The Perforating or die unit l3, as shown in Figs. 1-5, inclusive,comprises a plurality of punch rods 33 having heads 34 positionedbetween a metal rod holder plate 36 and a heat conducting plate 31, thelatter being of a material such as copper, which has good heatconductivity. To heat the plate 31, a plurality of heating wires orconductors 3B are molded or threaded in the heating plate 39 held inposition by a metal plate 40. The heat conducting plate 37 and theheating plate 39 are fastened to rod holder plate 36 by a plurality ofmachine screws such as shown at 4!.

Above plate 43 is a heat insulating pad 33, the .pad and plate 40 beingfastened to a press shoe Electrical energy is supplied to the heatingconductors through a Thus, as the pad 39 is heated, the heat isdistributed to the heads of the punching rods 33 by the conductor plate31, so that "the rods may become heated to any desired temperaturerequired.

on the top surface of the press shoe 33, is a yoke 4'4, in which aconnecting rod 45 is attached, the other end of the rod being connectedto the crank 43 of a shaft 41. Thus, rotation of the shaft 4? willoscillate the punch or die unit l3, and, consequently, the punch orperforating rods 33. An insulating pad'52 is attached to plate 36 byscrews 53. To orient the punch rods 33 accurately with respect toindex-pressure plate unit 8, the rod holder plate '36 is attached topress shoe 48 by precision sleeve spacers 55 through which stripperbolts, such as shown at 35, pass. Nuts 66 are used on the bolts 65.Surrounding the die unit I3 is further insulating material 61.

In'operati'on, the Fiberglas block 30, or other material to beapertured, is inserted between the guide runners 3i, hydraulic fluid isintroduced in the cylinder 1, and the index and pressure platecombination 8 is brought down on the block 30. Theplate 8 may firstcompress the block 30 or the plate 8 may be forced down by the unit I3as it is lowered, whilethe hydraulic unit or other locking devicemaintains it in position. It is only necessary that the block 33 beunder pressure during the coring operation. The shaft 41 is then rotatedand the rods 33 pass in and out of block 33 to a predetermined depthapproxichrome platecbare at this temperature, the contact surface of.plate is approximately 350 degrees F. i

There are several features of the device which enter into the making ofthe clean-cut holes in the fibrous material: (1) Pressure on the fiberblock creates an increased density therein durin the coring operation toproduce sharp perimeters for the'holes; (2) The guiding of'the punchrods 33 by theindexpressure unit 8 'keepsthe axes of therods parallel atall times; (3 The heating of the die rods softens the material andbinder to allow-them to reform to make a smooth wall for the holes;(4).The oscillation of the punch rods in the holes reforms thefibres byrepeated pierc- All of these features are that Fiberglasmay be coredwith clean, uniform V holes at uniform distancesapart very effectively.Althoughthe rods, which may be of copper and provided in the devicerality of holes described above, and cored blocks are produced whichhave a plurality of uniform and clean-cut holes.

Referring now to Figs. 6 and 7, the perforating rods 33 may also beheated differently from that shown in Figs. 1 to 5, inclusive. In Fig.6, the rod 33 is heated from a direct current energy source, such as 50,through protective resistors 5!. In this manner, the electrical energyPasses directly through the head 33. Therod 33 could also be split andthe slot filled with a dielectric material so that the electricalcurrent would actually pass through the sides of the rod, the rod actingas a resistor to electric current and thereby becoming hot. It isunderstood that alternating current may also be used. An inductiveheatin method is shown in Fig. 7, whereby the induction coil 54surrounds the rod. The coil 54 may travel with the rod or the rod 33could pass through an opening in the coil.

Referring now to Fig. 8, a cylindrical type of rod 33 is shown, togetherwith a squareor-rectangularly shaped rod 53, a triangularly shaped rod5?, a crescent shaped rod 58, and a slot rod 59. These rods will makeholes of the shape indicated at 6%), 61, 32, 63, andfi-l. The type orshape of core hole 33 can be successfully made with the invention, whichisnot practical with coring or perforating devices now; known in theart. It is to be understood that any combination of these rods and othershapes thereof may, be used to form pleasing patterns, such as rosettes,stars, and similar geometric designs, for decorative purposes.

I claim: I

1. A device for simultaneously punching .a plurality of holesdistributed over the entire area of a rectangular tile of fibrousandresinous material, comprising a rectangular-base plate for supportingsaid tile during the coring operation, guides having a height less thanthe thickness of said tile for positioning-said sheet on said plate, a'rectangular ind x-pressure plate adjacent said base plate, means forbringing said index-pressure plate into contact with the surface of saidtile at a predetermined pressure determined by the difference betweenthe height of said guides and the thickness of said tile, said plate andguides increasing the density of said tile determined by the fibrous andresinous nature of said tile, a rectangular punch plate adjacent said"indexpressure plate, a plurality of punch rods having one end of eachrod attached to said punch plate, said rods being uniformly distributedover the area of said plate and adapted to pass through holes in saidindex-pressure plate. for aligning and guiding said .rods'into saidtile, means for heating said rods, andcrank'rneans' for moving said rodsin said holes and into said tile.

A device fo simultaneously punching a plulstributed over the entire areaof a rectangular tile-oifibrous and resinous material, comprisin arectangular base plate for supporting said tile during the coringoperation, guides having a height less than the thickness of said tilefor positioning said sheet on said plate, a rectangular index-pressureplate adjacent said base plate, means for bringing said index-pressureplate into contact 'with the surface of said tile at a predeterminedpressure determined by the difference between the height of said guidesand the thickness of said tile, said plate and guides increasing thedensity of said tile determined by the fibrousand resinous nature ofsaid tile, a rectangular punch plate adjacent said index-pressure plate,a plurality of punch rods having one end of each rod attached to saidpunch plate, said rods being uniformly distributed over the area of saidplate and adapted to pass through holes in said index-pressure plate foralignin and guiding said rods into said tile, crank means for movingsaid rods in said holes and into said tile, means for uniformly heatingsaid rods at the heads thereof to a temperature of substantially 770degrees F. as they pass into said tile and pressure is applied theretoby said index-pressure plate.

3. A device for simultaneously punching a plurality of holes distributedover the entire area of a rectangular tile of fibrous and resinousmaterial, comprising a rectangular base plate for supporting said tileduring the coring operation, guides having a height less than thethickness of said tile for positioning said sheet on said plate, arectangular index-pressure plate adjacent said base plate, means forbringing said index-pressure plate into contact with the surface of saidtile at a predetermined pressure determined by the difference betweenthe height of said guides and the thickness of said tile, said plate andguides increasing the density of said tile determined by the fibrous andresinous nature of said tile, a rectangular punch plate adjacent saidindex-pressure plate, a plurality of punch rods having one end of eachrod attached to said punch plate, said rods being uniformly distributedover the area of said plate and adapted to pass through holes in saidindex-pressure plate for aligning and guiding said rods into said tile,crank means for moving said rods in said holes and into said tile, saidrods having large heads positioned in said punch plate and electricalmeans for heating said heads.

4. A device for simultaneously coring the entire area of a tile having acertain fibrous and resinous nature with holes of a predetermined andfinal size, comprising a base plate for supporting said tile during thecoring operation, guides for positioning said tile on said plate and forpredetermining the pressure applied to said tile, a rectangular pressureplate having a surface in a plane parallel with the surface of said baseplate and adapted to contact one entire face surface of said tile, meansfor moving said pressure plate into contact with the said surface ofsaid tile between said guides, said guides having a height less than thethickness of said tile to limit the movement of said pressure platetoward said base plate, said pressure plate and guides providing acertain density in said tile determined by the fibrous and resinousnature of said tile, a rectangular punch plate having a surface in aplane parallel with the surfaces of said pressure plate and base plate,a plurality of punch rods having their heads within said punch plate anddistributed over the area of said punch plate, heat transfer means incontact with said heads of said punch rods, means for uniformly heatingsaid heat transfer means, and means independent of said pressure platemoving means for moving said punch plate and said rods through openingsin said pressure plate and into said tile while under pressure of saidpressure plate.

5. A device in accordance with claim 4, in which said means for movingsaid pressure plate includes hydraulic members, and said means formoving said punch plate is a crank and rod combination.

6. A device in accordance with claim 4, in which a heating insulatingpad is positioned between said pressure plate and said tile.

CHARLES M. MUGLER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 856,837 Balding June 11, 19071,506,424 Hancock Aug. 26, 1924 1,533,681 Witkus Apr. 14, 1925 1,894,818Freeman Jan. 17, 1933 2,244,550 Chandler June 3, 1941 2,272,894Hulslander Feb. 10, 1942 2,278,288 Sadler Mar. 31, 1942 2,355,454 LuciusAug. 8, 1944 2,390,072 Beaton Dec. 4, 1945 2,408,488 Sorensen Oct. 1,1946

